I purchased this at a Williams Sonoma outlet in New York over 10 years ago. Diameter 20cm, height 20cm. Williams Sonoma's All-Clad D5 and D3 pots are sold as high-end products, but there is no such marking on the bottom of this pot. However, if my memory serves me correctly, this product can be used in the oven. It's possible to roast a whole chicken in the pot in the oven, and I believe it was written that the pot is made of multiple layers of metal. I haven't used it much, and I hardly use it now, so I'm putting it up for sale. I have included photos of any noticeable scratches or stains as much as possible, so please take a look. Also, regarding the dirt on the outside of the pot, I have cleaned it as much as possible, but please understand that I am not a professional, so it is not perfect. Please understand that this is a used item, as it is a personal inspection, and there may be some things I have missed. If you have any questions, please feel free to ask. Thank you very much.